Graham,
Yup, Nathan the double indirection of id *
1st, just the key snippet from FileController.m:
@implementation FileController
id mFileSheetDelegate;
=====
Here's the complete interface and implementation files for just one
SheetController, which has 2 buttons in its sheet window:
// SaveSheetController.h
#import <Cocoa/Cocoa.h>
@interface SaveSheetController:NSWindowController {
IBOutlet NSTextField *iboSaveDescription;
}
- (void) showSheetOnParentWindow:(NSWindow*)parentWindow
withDescription:(NSString*)theDescription
delegate:(id)theTarget
contextInfo:(void*)contextInfo;
- (void) sheetDidEnd:(NSWindow*)sheet
returnCode:(int)returnCode
contextInfo:(void*)contextInfo;
- (IBAction) saveIt:(id)sender;
- (IBAction) dontSaveIt:(id)sender;
- (void) closeSheet:(id)sender withCode:(int)theCode;
@end
===========
// SaveSheetController.m
#import "SaveSheetController.h"
enum {
kJustSave, /* 0, 1 */
kJustNotSave
};
@implementation SaveSheetController
extern id mFileSheetDelegate;
- (void) showSheetOnParentWindow:(NSWindow*)parentWindow
withDescription:(NSString*)theDescription
delegate:(id)theTarget
contextInfo:(void*)contextInfo {
mFileSheetDelegate = theTarget;
if (theDescription) {
// do magic
}
[NSApp beginSheet:[self window]
modalForWindow:parentWindow
modalDelegate:theTarget
didEndSelector:@selector
(sheetDidEnd:returnCode:contextInfo:)
contextInfo:contextInfo];
}
// 2 buttons of saveSheet
- (IBAction) saveIt:(id)sender {
[self closeSheet:sender withCode:kJustSave];
}
- (IBAction) dontSaveIt:(id)sender {
[self closeSheet:sender withCode:kJustNotSave];
}
- (void) closeSheet:(id)sender withCode:(int)theCode {
NSWindow* theSheet;
theSheet = [sender window];
[NSApp endSheet:theSheet returnCode:theCode]; // calls didEndSelector
}
- (void) sheetDidEnd:(NSWindow*)sheet
returnCode:(int)returnCode
contextInfo:(void*)contextInfo {
[mFileSheetDelegate doSheetSelection:returnCode
contextInfo:contextInfo];
[sheet orderOut:self];
}
@end
========
Finally, a snippet or two from [doSheetSelection:contextInfo]:
- (void) doSheetSelection:(int)returnCode
contextInfo:(void*)contextInfo {
/*
If we had different sheets returning the same code,
then we would select between the different sheet IDs.
But, for our case, all returned IDs are unique.
if ([(NSString*)contextInfo isEqualToString:sCalculateSheetID]) {
}
if ([(NSString*)contextInfo isEqualToString:sSaveSheetID]) {
}
if ([(NSString*)contextInfo isEqualToString:sErrorSheetID]) {
}
*/
switch (returnCode) {
case kJustSave:
[self saveSpreadsheet];
gShouldCloseDoc = TRUE;
break;
case kJustNotSave:
[self setStatus:sFileNotSavedMsg];
gShouldCloseDoc = TRUE;
break;
}
========
Okay ... all the snippets are done ... now, the questions:
(1) warning: no doSheetSelection:contextInfo method found which, I think, is
due to the fact that the external class of mFileSheetDelegate =
FileController, yet when referenced in SaveSheetController, it's = id, a
general pointer. But, I thought all anonymous pointers were resolved at
runtime ... am I just going to force myself to ignore this Build Warning,
knowing that it will all go away at runtime???
(2)I still get "unrecognized selector" .. but,
didEndSelector:@selector(sheetDidEnd:returnCode:contextInfo:)
is within the sheet.m .. good grief!
John
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